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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5df7941b42b8a9e02f7b2af607296160ec818be9082fc3dc761b3dcb0689d5cc' 
  AND token = 'Fm09wCiydSl1NporkZYiXIQJ3D8vcDI/MIaA75ly2Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}